Writing transactional letters

Dear Sir,

I am writing to express my strong dissatisfaction with the intensive Spanish Corse.

Firstly, when  I saw your advertisment in the street I  thought it could be a good idea to learn some spanish and you guarantee myself a good acomodation  with a Spanish family but this family was unfriendly.

Secondly, I have not had a high experienced talking this language, because I  have a bad time and they always were shouting and because of it I couldn’t concentrate.

Thirly, and to finish with, I pay for a trip to the City Museun and the trip was canceled and nobody told me. Neither they pass my trip for another day nor, they did not pay the refunded.

I insist and demand a full refund and I hope I will not be forced to take further actions.

Your faithfully,

Sol Di Liscia